Bicycle frame



FIG. 1 depicts a perspective view of a bicycle frame, showing the novel design;

FIG. 2 depicts a perspective view of the bicycle frame from the opposite side and opposite end, showing the novel design; and,

FIG. 3 depicts a side view of the bicycle frame, showing the novel design.

The dashed broken lines are provided for purposes of environment and form no part of the claimed design. 

What is claimed is the ornamental design for a bicycle frame, as shown and described. 